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https://github.com/JakeHillion/object-introspection.git
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688d483c0c
We previously moved container identification later in CodeGen in order to preserve information for AlignmentCalc. However, Flattener needs to know if a class is a container in order to apply its special handling for this case. This new approach moves container identification in front of Flattener, but has Container own a type node, representing its layout. This underlying type node can be used for calculating a container's alignment in a later pass.
112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <memory>
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#include <unordered_map>
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#include <vector>
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#include "TypeGraph.h"
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#include "Types.h"
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struct drgn_type;
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struct drgn_type_template_parameter;
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struct drgn_error;
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struct ContainerInfo;
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namespace oi::detail::type_graph {
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struct DrgnParserOptions {
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bool chaseRawPointers = false;
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bool readEnumValues = false;
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};
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/*
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* DrgnParser
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*
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* Reads debug information from a drgn_type to build a type graph.
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* Returns a reference to the Type node corresponding to the given drgn_type.
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*
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* DrgnParser tries to balance two philosophies:
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* - Simplicity: containing minimal logic other than reading info from drgn
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* - Performance: reading no more info from drgn than necessary
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*
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* For the most part we try to move logic out of DrgnParser and have later
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* passes clean up the type graph, e.g. flattening parents and identifying
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* containers.
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*/
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class DrgnParser {
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public:
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DrgnParser(TypeGraph& typeGraph, DrgnParserOptions options)
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: typeGraph_(typeGraph), options_(options) {
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}
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Type& parse(struct drgn_type* root);
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private:
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Type& enumerateType(struct drgn_type* type);
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Class& enumerateClass(struct drgn_type* type);
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Enum& enumerateEnum(struct drgn_type* type);
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Typedef& enumerateTypedef(struct drgn_type* type);
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Type& enumeratePointer(struct drgn_type* type);
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Array& enumerateArray(struct drgn_type* type);
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Primitive& enumeratePrimitive(struct drgn_type* type);
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void enumerateTemplateParam(struct drgn_type* type,
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drgn_type_template_parameter* tparams,
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size_t i,
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std::vector<TemplateParam>& params);
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void enumerateClassTemplateParams(struct drgn_type* type,
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std::vector<TemplateParam>& params);
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void enumerateClassParents(struct drgn_type* type,
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std::vector<Parent>& parents);
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void enumerateClassMembers(struct drgn_type* type,
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std::vector<Member>& members);
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void enumerateClassFunctions(struct drgn_type* type,
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std::vector<Function>& functions);
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template <typename T, typename... Args>
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T& makeType(struct drgn_type* drgnType, Args&&... args) {
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auto& newType = typeGraph_.makeType<T>(std::forward<Args>(args)...);
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drgn_types_.insert_or_assign(drgnType, newType);
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return newType;
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}
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bool chasePointer() const;
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// Store a mapping of drgn types to type graph nodes for deduplication during
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// parsing. This stops us getting caught in cycles.
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std::unordered_map<struct drgn_type*, std::reference_wrapper<Type>>
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drgn_types_;
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TypeGraph& typeGraph_;
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int depth_;
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DrgnParserOptions options_;
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};
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class DrgnParserError : public std::runtime_error {
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public:
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DrgnParserError(const std::string& msg) : std::runtime_error{msg} {
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}
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DrgnParserError(const std::string& msg, struct drgn_error* err);
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~DrgnParserError();
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private:
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struct drgn_error* err_ = nullptr;
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};
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} // namespace oi::detail::type_graph
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